Plug built-in type optical measurement probe, and optical measurement device provided with the same

Abstract

There are provided a plug built-in type optical measurement probe capable of obtaining a more accurate measurement value, and an optical measurement device provided with the same. A spark section and a light receiving section are held by a plug main body while being arranged next to each other in a protruding manner such that an end face of a holder is arranged at a position where discharge light from the spark section does not enter the field of view of the light receiving section. Accordingly, the light receiving section can be held in a manner protruding from the plug main body, and entering of the discharge light from the spark section can be restricted by the holder of the light receiving section. That is, by arranging the end face of the holder at a position where the discharge light from the spark section does not enter the field of view of the light receiving section, the light receiving intensity of the discharge light from the spark section can be prevented from being added to a measurement value, and it is possible to measure only the light generated at the time of combustion, and thus, a more accurate measurement value can be obtained.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an optical measurement probe for guiding light generated at a time of combustion to an appliance, and an optical measurement device provided with the same, and more particularly, to a plug built-in type optical measurement probe including a spark section for performing ignition by spark discharge between electrodes, and an optical measurement device provided with the same.[0003]2. Description of the Related Art[0004]For example, at the time of evaluating the combustion state in a combustion chamber of an internal combustion engine of a car, measurement is performed using an optical measurement probe for guiding light generated at the time of combustion to an appliance (for example, see JP-A-2012-118080, and JP-A-2011-241753). As an example of such an optical measurement probe, a plug built-in type optical measurement probe including a spark section for performing ignition by spark discha...

AI Technical Summary

Benefits of technology

This patent text describes a plug built-in type optical measurement probe that can obtain more accurate measurement values. The probe has a light receiving section that can be held in a way that prevents the entry of discharge light from a spark section, ensuring that the light receiving intensity of the discharge light is not added to the measurement value. Additionally, the light receiving section is designed to allow for easy maintenance. Overall, this present invention provides a more accurate measurement value and makes it easier to maintain the optical measurement device.

Problems solved by technology

In this case, there is a problem that accurate measurement of only the combustion light in the combustion chamber, which is the measurement target, is not performed.

Accordingly, dirt including soot, engine oil and the like may adhere to the incidence surface of the light receiving section, and the adhered matter may affect the measurement value.

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